At least in this case, the good guys won - Justin Amash wins against opponent heavily funded by crony capitalists at the US Chamber of Commerce (DailyCaller). From Adam Smith's Wealth of Nations:
People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices. It is impossible indeed to prevent such meetings, by any law which either could be executed, or would be consistent with liberty and justice.
But though the law cannot hinder people of the same trade from sometimes assembling together, it ought to do nothing to facilitate such assemblies; much less to render them necessary. A regulation which obliges all those of the same trade in a particular town to enter their names and places of abode in a public register, facilitates such assemblies. . . . A regulation which enables those of the same trade to tax themselves in order to provide for their poor, their sick, their widows, and orphans, by giving them a common interest to manage, renders such assemblies necessary. An incorporation not only renders them necessary, but makes the act of the majority binding upon the whole.